/Engine/Source/Runtime/Messaging/Public/IMessageTracer.h
Gets the list of known message types filtered by name.
The number of message types returned.
int32 GetMessageTypes ( [TArray](API\Runtime\Core\Containers\TArray)< [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FMessageTracerTypeInfo](API\Runtime\Messaging\FMessageTracerTypeInfo) >> & OutTypes ) const